package com.bjfu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.bjfu.eduservice.entity.EduSubject;
import com.bjfu.eduservice.entity.excel.SubjectData;
import com.bjfu.eduservice.service.EduSubjectService;
import com.bjfu.servicebase.exceptionhandler.GuliException;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    // 因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    // 不能实现数据库操作
    private EduSubjectService subjectService;

    public SubjectExcelListener(){}

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    // 读取Excel内容，一行一行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData == null){
            throw new GuliException(20001,"文件数据为空");
        }

        // 一行一行读，一级分类不能重复需要判断，二级分类也不能重复需要判断
        EduSubject oneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(oneSubject == null){
            oneSubject = new EduSubject();
            oneSubject.setParentId("0");
            oneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(oneSubject);
        }

        // 可以直接获取到mp生成的id值
        String pid = oneSubject.getId();
        EduSubject twoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (twoSubject == null) {
            twoSubject = new EduSubject();
            twoSubject.setTitle(subjectData.getTwoSubjectName());
            twoSubject.setParentId(pid);
            subjectService.save(twoSubject);
        }
    }

    // 判断是否有一级分类
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    // 判断是否有二级分类
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
